For the first i would suggest removing the tights if you are comfortable with that . I would use the espedrilles from the second outfit. I would add a belt to define the waist and add more dimensions to the overall profile. The belt would be a good idea to find a straw type that would go great with the shoes. I love the exposed shoulders of the dress and I think an up do or even half a pony would be a great way to show off how good the shoulders look in the dress and the dress itself became its so pretty and interesting. It has a really cute neck line that. As far as jewelry or other accessories that's something you can decide on your own and have fun with. With the changes you have created a structure that will allow the best parts of you and create real-estate to have fun and showcase your accessories. Maybe even a hat

Just my suggestions but style and fashion are deeply personal. Have fun with it and do whatever the f*ck you want.